Agomelatine (S-20098) L(+)-Tartaric acid is a specific agonist of MT1 and MT2 receptors (Kis: 0.1, 0.06, 0.12, and 0.27 nM for CHO-hMT1, HEK-hMT1, CHO-hMT2, and HEK-hMT2). It also is a selective 5-HT2C receptor antagonist (pKis: 6.4 and 6.2 at native (porcine) and cloned (human) 5-HT2C receptors).
L-902688 is an orally active EP4 receptor agonist (Ki: 0.38 nM; EC50: 0.6 nM). L-902688 displays >4,000-fold selective for EP4 over other EP and prostanoid receptors.
L-APB is an effective and specific agonist for the group III mGluRs (EC50s: 0.13, 0.29, 1.0, 249 μM for mGlu4, mGlu8, mGlu6, and mGlu7 receptors, respectively).